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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee3ed4c9722ecf84e60254fc616d87616d75a3e1b0da90f546791a00b5bcfd2' 
  AND token = 'P6RDpfxWL4sZM6KKBWHtA3FP9kpYUvqXADUYNGHAWQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}